摘要
渣油加氢装置循环氢中硫化氢是由加氢脱硫产生的,其含量主要是通过循环氢脱硫塔中贫胺液来吸收控制。以双系列渣油加氢中的第二系列循环氢中硫化氢含量超高为例,分析超高原因是开工前反应系统里残留的硫化亚铁生热、自燃而影响脱硫塔内构件及其副线阀所致。提出了在开停工期间预防此种事故的几点措施:反应系统必须做好严格的隔离,氮气吹扫应一次通过,且氮气充至微正压保护;停工期间应对硫化氢所途经的设备和管线进行严格的吹扫和清洗,并用弱碱液进行30~50℃条件下24 h循环碱洗;塔、容器检修时,应做好必要的事故预案和预防措施;检修期间各塔器温度应控制在45℃以下;装置运行周期中做好高压缓蚀剂的加注工作。
The hydrogen sulfide generated during the process of hydrogenation reaction is mainly absorbed by the lean amine in the recycle hydrogen desulfurization tower. In a case study of a higher hydrogen sulfide in the double-train hydrogenation unit,the higher hydrogen sulfide is found to be the result of iron sulfide remaining in the reaction system that is oxidized and releases heat which has damaged the internal components of the absorber and the bypass valve before the start-up of train 2. Several measures are recommended to prevent the accidents in the start-up and shutdown operations： good isolation must be available in the reaction system.Nitrogen must flow through and the reaction system is kept in a micro positive pressure state; During the shut down,the equipment and piping in which the hydrogen sulfide flows must be purged and cleaned,and washed with weak caustic liquid at temperature of 30 ~ 50 ℃ for 24 hours. For the maintenance of towers and vessels,emergency response measures must be available. During the maintenance,the temperature of towers should be controlled at lower than 45 ℃. High pressure corrosion inhibitor must be injected in the operation cycle of the unit.
作者
陈健
Chen Jian(SINOCHEM Quanzhou Petrochemical Co.,Ltd.,Quanzhou,Fujian 362103)
出处
《炼油技术与工程》
CAS
2018年第7期34-37,共4页
Petroleum Refinery Engineering
关键词
渣油加氢
循环氢脱硫塔
硫化氢
硫化亚铁自燃
膜分离系统
residue oil hydrotreating
recycle hydrogen absorber
hydrogen sulfide
self-ignition of iron sulfide
membrane separation system
